This topic describes the specifications of performance-enhanced standard instances of ApsaraDB for Redis Enhanced Edition. These specifications include the memory capacity, number of concurrent connections to each instance, maximum bandwidth, and queries per second (QPS) value.
Instance types
| Instance type | InstanceClass that is used in API operations | Number of CPU cores | Number of I/O threads | Maximum number of new connections per second | Maximum number of concurrent connections | Bandwidth (MB/s) | QPS value |
|---|---|---|---|---|---|---|---|
| 1 GB master-replica performance-enhanced instance | redis.amber.master.small.multithread | 6 | 4 | 10,000 | 30,000 | 96 | 240,000 |
| 2 GB master/replica performance-enhanced instance | redis.amber.master.mid.multithread | 6 | 4 | 10,000 | 30,000 | 96 | 240,000 |
| 4 GB master-replica performance-enhanced instance | redis.amber.master.stand.multithread | 6 | 4 | 10,000 | 30,000 | 96 | 240,000 |
| 8 GB master-replica performance-enhanced instance | redis.amber.master.large.multithread | 6 | 4 | 10,000 | 30,000 | 96 | 240,000 |
| 16 GB master-replica performance-enhanced instance | redis.amber.master.2xlarge.multithread | 6 | 4 | 10,000 | 30,000 | 96 | 240,000 |
| 32 GB master-replica performance-enhanced instance | redis.amber.master.4xlarge.multithread | 6 | 4 | 10,000 | 30,000 | 96 | 240,000 |
| 64 GB master-replica performance-enhanced instance | redis.amber.master.8xlarge.multithread | 6 | 4 | 10,000 | 30,000 | 96 | 240,000 |
Calculation rules for bandwidth values
- The bandwidth value in the preceding table is the bandwidth of the instance. The bandwidth value is the sum of the bandwidth of all shards or nodes on the instance.
- The upper limit of the total bandwidth for a read/write splitting instance is 2,048 MB/s. The preceding table describes the upper limits. After the upper limit is reached, the bandwidth cannot be increased even if you add more shards or nodes.
- The bandwidth value applies to the upstream and downstream bandwidths. For example, if the bandwidth of an instance is 10 MB/s, the upstream and downstream bandwidths of the instance are both 10 MB/s.
- The bandwidth in the preceding table is the internal bandwidth of the ApsaraDB for Redis instance. The Internet bandwidth is determined by the internal bandwidth and is limited by the bandwidth of the connection between the instance and a client. We recommend that you use an internal network to maximize the performance of the instance.
Calculation rules for connections
The following example shows the maximum number of new connections that can be created per second: The maximum number of new connections per second of an instance is 10,000. The maximum number of connections of an instance is 50,000. The actual number of connections at the Nth second after the instance starts to run is 12,000. Then, at the (N+1)th second, the number of connections is 22,000, which is calculated by using the formula 12,000 + 10,000.
FAQ
Q: Why is the maximum number of concurrent connections of my instance different from the maximum number of concurrent connections of the same instance that is described in this topic?
A: The maximum number of concurrent connections of some instance types may be adjusted after the service is upgraded. If the maximum number of concurrent connections of your instance is different from the maximum number that is described in this topic, modify your instance configurations to update the bandwidth. Make sure that you select the same instance type when you change the specifications. For more information, see Change the specification of an ApsaraDB for Redis instance.